package com.haojiangbo.utils;

import java.nio.charset.Charset;

/**
  * https://blog.csdn.net/l1028386804/article/details/53821674
  * @date 2020/10/26 15:58
  */
public class ByteUtil {
   public static byte[] getBytes(short data) {
       byte[] bytes = new byte[2];
       bytes[0] = (byte) (data & 0xff);
       bytes[1] = (byte) ((data & 0xff00) >> 8);
       return bytes;
   }

   public static byte[] getBytes(char data) {
       byte[] bytes = new byte[2];
       bytes[0] = (byte) (data);
       bytes[1] = (byte) (data >> 8);
       return bytes;
   }

   public static byte[] getBytes(int data) {
       byte[] bytes = new byte[4];
       bytes[0] = (byte) (data & 0xff);
       bytes[1] = (byte) ((data & 0xff00) >> 8);
       bytes[2] = (byte) ((data & 0xff0000) >> 16);
       bytes[3] = (byte) ((data & 0xff000000) >> 24);
       return bytes;
   }

   public static byte[] getBytes(long data) {
       byte[] bytes = new byte[8];
       bytes[0] = (byte) (data & 0xff);
       bytes[1] = (byte) ((data >> 8) & 0xff);
       bytes[2] = (byte) ((data >> 16) & 0xff);
       bytes[3] = (byte) ((data >> 24) & 0xff);
       bytes[4] = (byte) ((data >> 32) & 0xff);
       bytes[5] = (byte) ((data >> 40) & 0xff);
       bytes[6] = (byte) ((data >> 48) & 0xff);
       bytes[7] = (byte) ((data >> 56) & 0xff);
       return bytes;
   }

   public static byte[] getBytes(float data) {
       int intBits = Float.floatToIntBits(data);
       return getBytes(intBits);
   }

   public static byte[] getBytes(double data) {
       long intBits = Double.doubleToLongBits(data);
       return getBytes(intBits);
   }

   public static byte[] getBytes(String data, String charsetName) {
       Charset charset = Charset.forName(charsetName);
       return data.getBytes(charset);
   }

   public static byte[] getBytes(String data) {
       return getBytes(data, "GBK");
   }

   public static short getShort(byte[] bytes) {
       return (short) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
   }

   public static char getChar(byte[] bytes) {
       return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
   }

   public static int getInt(byte[] bytes) {
       return (0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)) | (0xff0000 & (bytes[2] << 16))
               | (0xff000000 & (bytes[3] << 24));
   }

   public static long getLong(byte[] bytes) {
       return (0xffL & (long) bytes[0]) | (0xff00L & ((long) bytes[1] << 8)) | (0xff0000L & ((long) bytes[2] << 16))
               | (0xff000000L & ((long) bytes[3] << 24)) | (0xff00000000L & ((long) bytes[4] << 32))
               | (0xff0000000000L & ((long) bytes[5] << 40)) | (0xff000000000000L & ((long) bytes[6] << 48))
               | (0xff00000000000000L & ((long) bytes[7] << 56));
   }

   public static float getFloat(byte[] bytes) {
       return Float.intBitsToFloat(getInt(bytes));
   }

   public static double getDouble(byte[] bytes) {
       long l = getLong(bytes);
       System.out.println(l);
       return Double.longBitsToDouble(l);
   }

   public static String getString(byte[] bytes, String charsetName) {
       return new String(bytes, Charset.forName(charsetName));
   }

   public static String getString(byte[] bytes) {
       return getString(bytes, "UTF-8");
   }

}
